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Reportable Segments - Reportable Segment Financial Information (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
EMG |  |
Segment Reporting Information [Line Items] |  |
Additions to property, plant and equipment from acquired business | $ 20.0 | $ 29.2

X
- Definition Acquired property, plant and equipment. + References No definition available. + Details
Name: | ame_AcquiredPropertyPlantAndEquipment
Namespace Prefix: | ame_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ame_ElectromechanicalGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |